MultiSonic220 MIG-Dead Instructor Guide

Drill

• MultiSonic220 MIG-dead drill
• MultiSonic220 MIG-dead answer key

Use This Guide For

• teaching process isolation on multiprocess machines
• stopping the habit of treating MIG-only complaints like shared power-source failures

Opening Prompt

• "Stick and TIG work on a MultiSonic220, but MIG is dead and a spool gun is also in the case. What do you prove first?"

What To Listen For First

• the trainee should say polarity connector and stripped-down base MIG setup first
• they should recognize that one healthy process is strong evidence against a shared power-source failure

Redirect Questions

• if they blame the machine too early: "What does it mean that stick and TIG are still healthy?"
• if they get lost in accessories: "What is the plainest base MIG setup you can prove before touching the spool gun?"

Strong Answer Markers

• they move from measurement card to parts substitution card before internal opening
• they separate spool-gun-only faults from base-machine faults
• they keep flashing-panel history in mind without letting it override the process split

Common Failure Modes

• skipping polarity connector proof
• blaming the feeder or power board before base MIG is proven
• letting the presence of a spool gun confuse the entire complaint

Debrief Notes

• reinforce that process isolation is one of the fastest ways to avoid bad board calls on multiprocess units
• internal opening is justified only after base MIG, polarity, and accessory paths are already bounded